CN103650211B - There is the series of cells of the security of improvement - Google Patents

There is the series of cells of the security of improvement Download PDF

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Publication number
CN103650211B
CN103650211B CN201280035095.XA CN201280035095A CN103650211B CN 103650211 B CN103650211 B CN 103650211B CN 201280035095 A CN201280035095 A CN 201280035095A CN 103650211 B CN103650211 B CN 103650211B
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China
Prior art keywords
series
battery unit
battery module
cells
battery
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CN201280035095.XA
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Chinese (zh)
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CN103650211A (en
Inventor
卢泰焕
李珍圭
崔晙硕
张珉哲
申寅撤
姜达模
金性泰
金台爀
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Lg Energy Solution
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LG Chemical Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/51—Connection only in series
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Providing a kind of series of cells, the battery module wherein with multiple battery unit of being connected in series or single-bit module is connected in series in closely attachment or closely stacking state. This series of cells comprises: fusible cut-out, and it is connected in series to the electrical connection circuit of battery module; And isolating switch, transmit electric current on the outside surface of at least one in its mounted battery module thus when battery cell swell, and it is electrically connected to electrical connection circuit thus stops when transmitting electric current due to battery cell swell to fusible cut-out supply electric power.

Description

There is the series of cells of the security of improvement
Technical field
The present invention relates to the series of cells of a kind of security with improvement, and more specifically relate to following series of cells, this series of cells is configured to, battery module is made mutually to be in close contact in this battery module or stacking adjacent to each other state is connected in series mutually, each in this battery module comprises the multiple battery unit or single-bit module that are mutually connected in series, this series of cells comprises fusible cut-out and isolating switch, this fusible cut-out is connected in series in the electrical connection circuit between battery module, the outside of at least one that this isolating switch is arranged in battery module, to perform conductivity when battery unit swells, when performing conductivity when the protuberance due to battery unit, this isolating switch is electrically connected to this electrical connection circuit to disconnect fusible cut-out.
Background technology
Because running gear is developed increasingly, and the requirement for this kind of running gear increases, so as the energy being used for running gear, the requirement for secondary cell increases sharply. In this kind of secondary cell, lithium secondary battery has high-energy-density and sparking voltage, has carried out big quantifier elimination for lithium secondary battery and lithium secondary battery is commercially used now and is widely used.
As the energy of the driven by power device for such as electronic bike (E-bike), electric vehicle (EV) and motor vehicle driven by mixed power (HEV), and the energy of the sub-device of mobile radio for such as mobile telephone, digital camera, personal digital assistant (PDA) and laptop computer, secondary cell has attracted sizable concern.
The compact battery group wherein having installed battery unit is used to the packaged unit of such as mobile telephone and digital camera. On the other hand, hereinafter, the medium-sized or large-sized battery pack wherein having installed the series of cells (being also called " multiple-unit ") comprising two or more battery unit that is parallel with one another and/or that be connected in series is used to the medium-sized of such as laptop computer and electric vehicle or large-scale plant.
As mentioned above, it is necessary, lithium secondary battery presents excellent electrical property; But, lithium secondary battery has low-security. Such as, when the abnormal operation of lithium secondary battery occurs, such as excessively charging, over-discharge can, be exposed to high temperature and electricity short circuit time, cause the active material as battery component and the decomposition of ionogen, result produces heat and gas, and the high temperature and high pressure state caused by the generation of heat and gas accelerates above-mentioned decomposition. Finally, it is possible to presence of fire or blast.
Therefore; lithium secondary battery is provided with security system; such as when battery excessively charged or during over-discharge can or when overcurrent flows in the battery interruptive current protection circuit, when the temperature of battery increases, its resistance increases thus the positive temperature coefficient of interruptive current (PTC) element widely, with for the interruptive current when pressure increases owing to producing gas or the security ventilation opening discharging gas. In the situation of small-sized cylindrical secondary battery, such as, usually PTC-element and security ventilation opening are set at the top place being installed in electrode assemblie (generating element) in cylindrical container, that there is cathode/separator/anode structure. On the other hand, in the situation of small-sized prismatic or pouch-typed secondary battery, the upper end of the prismatic container or bag shape shell of usually having installed generating element wherein in sealed states installs protection circuit module and PTC-element.
For there is the medium-sized of multi-unit structure or large-sized battery pack, the security associated problem of lithium secondary battery and then more serious. Because using multiple battery unit in multi-unit battery group, so certain some the abnormal operation in battery unit can cause the abnormal operation of other battery unit, the possibility of result presence of fire or blast, this may cause extensive accident. Therefore, medium-sized or large-sized battery pack is provided with the security system of such as battery management system (BMS), to prevent the excessive charging of battery unit, over-discharge can and overcurrent.
Meanwhile, along with lithium secondary battery is used by continuing, namely along with lithium secondary battery is little by little deteriorated by charging and discharging repeatedly, generating element and electric connecting part. Such as, the deterioration of generating element causes the decomposition of electrode materials and ionogen, thus produces gas. As a result, battery unit (container or bag shape shell) little by little swells. In the standard state of lithium secondary battery, over-discharge can, excessively charging or the overcurrent of the active controller detection series of cells of such as BMS. In the situation that the over-discharge can of the series of cells detected, excessively charging or overcurrent are excessive, active controller interrupts the risk of the electrical connection in series of cells to reduce series of cells.
About this kind of situation, Fig. 1 is the exemplary view of the circuit illustrating conventional batteries. With reference to figure 1, conventional batteries 50 comprise be made up of multiple battery unit battery module 100, for detecting the information of the operational stage about battery module 100 and the BMS60 for controlling battery module 100 based on Detection Information, and connect and disconnecting unit (rly.) 70 for the electric power performing to connect and disconnect between battery module 100 and outside input and output circuit (invertor) 80.
In the situation that battery module 100 normally operates, BMS60 keeps electric power connection and disconnecting unit 70 to be in connection state. In the situation of abnormality sensing battery module, electric power is connected by BMS60 and the state of disconnecting unit 70 is switched to shutoff state to interrupt the charging and discharging of battery module 100. On the other hand, extremely operate or in inactive situation, BMS60 does not perform any control at BMS60. Therefore, electric power connection and disconnecting unit 70 remain in connection state. As a result, even if in error state (ERST), also continue the charging and discharging that ground performs battery module 100.
But, in the situation using active controller as described above, it is necessary to the outside electric current of BMS supply. Therefore, if being supplied to BMS without any electric current, then BMS may not protect series of cells. That is, active controller checks the charging state of battery and uses electrical signal control battery. But, it is necessary to supply electric power to active controller. Therefore, when electric power normally is not fed to active controller, active controller can not be a kind of basic solution.
In addition, when lithium secondary battery is excessively charged, gas may leak or may occur fire or the blast of lithium secondary battery from lithium secondary battery. When lithium secondary battery is used as the high-voltage for vehicle, high-capacity battery group, preventing in injury to personnel and vehicle damage, the security of lithium secondary battery is important.
Therefore, it is necessary to be a kind of protector of series of cells offer, to prevent gas leaks from the lithium secondary battery excessively charged or prevents fire or the blast of lithium secondary battery.
As an example of protector, can rupture due to the protuberance reactive force of battery unit in the electrode terminal connection portion between battery unit, thus disconnect the electrical connection circuit of series of cells.
But, in above protector, it is necessary to reduce the intensity of electrode terminal or reduce the thickness of electrode terminal so that can easily rupture in the electrode terminal connection portion between battery unit. The electrode terminal manufactured as described above has low ability to bear for the applied external force of such as vibration or impact.
In addition, in order to make protector disconnect electrode terminal connection portion, it is necessary to be equivalent to the big reactive force of the tensile strength of electrode terminal. Order ground for this reason, it is necessary to battery unit is excessively charged significantly so that battery unit excessively swells. As a result, gas may easily from battery drain or fire or blast that battery may easily occur.
Accordingly, it may be possible to while overcoming the above problems, substantially guarantee that the technology of the security of series of cells is highly necessary.
Summary of the invention
Technical problem
Realize the present invention to overcome the above problems Buddhist monk's other technical problem to be solved.
It is an object of the present invention to provide a kind of series of cells comprising isolating switch and fusible cut-out, make when battery unit is due to the abnormal operation of such as excessively the charging of battery module, over-discharge can and overcurrent, or the deterioration of the battery module caused by the charging and discharging of battery unit and when swelling, circuit breaker sense to disconnect fusible cut-out, thus guarantees desired level of security to the expansion of the volume in the outside of battery unit.
Another object of the present invention is to provide a kind of series of cells, and by adding little simple component, this series of cells can mechanically operate, and thus this series of cells is easy to manufacture and is differently manufactured based on this.
Technical scheme
According to an aspect of the present invention, can by providing a kind of series of cells to realize above and other object, this series of cells is configured to, battery module is made mutually to be in close contact in this battery module or stacking adjacent to each other state is connected in series mutually, each in this battery module comprises the multiple battery unit or single-bit module that are mutually connected in series, this series of cells comprises fusible cut-out and isolating switch, this fusible cut-out is connected in series in the electrical connection circuit between battery module, the outside of at least one that this isolating switch is arranged in battery module, to perform conductivity when battery unit swells, when performing conductivity when the protuberance due to battery unit, this isolating switch is electrically connected to this electrical connection circuit to disconnect fusible cut-out.
As in front description, comprise multiple battery unit or battery model calling to the series of cells for electric unit in, battery management system (BMS) detection supplies the operational stage of electric unit and controls the charging and discharging for electric unit based on the operational stage for electric unit detected, thus guarantees the security of series of cells. But, at BMS due to electric current supply failure in inactive situation, control is impossible for the charging and discharging of electric unit.
On the other hand, comprise according to the series of cells of the present invention and being configured to independent of BMS the ground isolating switch that operates and fusible cut-out. Therefore, when for electric unit generation fault, isolating switch only senses the expansion of the volume of battery unit or battery module and disconnects fusible cut-out based on this. As a result, the electrical connection in series of cells is interrupted, and therefore prevents the overcurrent of battery module or superpotential to be transferred to outside input and output terminal, thus guarantees the security of series of cells.
In addition, isolating switch according to the present invention does not need other electric power. As a result, there is not the fault of any isolating switch according to electrical signal, and when not supplying electric power, isolating switch normally operates. Therefore, the reliability of isolating switch is very high.
In an example, the electrode terminal part of series of cells can be fixed, even if making also to maintain the stacked state of battery module when the volume of battery unit changes, and the part place that the side of can be focused on by the expansion stress being arranged in the protuberance due to battery unit causes one of battery module of isolating switch is corresponding.
Therefore, isolating switch can survey the protuberance of battery unit in the part place corresponding with this side of battery module sense, so that the electrical connection circuit conduction between battery module, thus disconnects fusible cut-out easily.
In addition, isolating switch can feel the protuberance surveying the excessively battery unit of charging, and interrupted the electrical connection circuit between battery module at gas before battery unit leakage or battery unit presence of fire or blast, thus guarantees the security of series of cells.
In another example, the position of isolating switch is not particularly limited, as long as isolating switch is positioned at the part place that isolating switch can easily feel the protuberance surveying battery unit. Preferably, isolating switch is located in the part place corresponding with the side of outer battery module.
Therefore, isolating switch is arranged on this side place of the outer battery module that the expansion stress that the protuberance due to battery unit causes focuses on, and thus feels the exception surveying battery module easily.
In a preferred embodiment, this isolating switch can comprise: the first conducting parts, the side of in its contact battery module; 2nd non-conductive parts, it is fixed in the state of position at the 2nd parts about battery module, guides part to be couple to the first parts via elasticity; And conducting parts, it comprises cathode conductive portion and anode conducting part, this cathode conductive portion and anode conducting part are installed to the 2nd parts, cathode conductive portion and anode conducting part is made to be formed with the first parts and contact according to the increase of the volume of battery module when battery unit swells, the electrical connection circuit that cathode conductive portion and anode conducting part are electrically connected between battery module.
Based on the structure of physics as above or machinery isolating switch, even if when BMS occurs the security also guaranteeing series of cells during fault to be possible. In addition, as mentioned above, it is necessary, by adding little simple component, mechanically operate according to the series of cells of the present invention, thus this series of cells is easy to manufacture and application based on this various structures is possible.
Cathode conductive portion and the anode conducting part of isolating switch can be electrically connected to respectively via wire as an example of above structure, the cathode terminal of a battery module outer and the anode terminal of another outer battery module.
In another example, in the state that battery module normally operates, the first parts and conducting parts can be separated by mutual electricity. When in the state extremely operated in battery module, when battery unit swells, first parts outwards can be pushed by the battery module of volumetric expansion, the opposite end of the first parts can contact with the formation of anode conducting part with cathode conductive portion as a result, thus high electric current flows between cathode conductive portion and anode conducting part, and therefore fusible cut-out disconnects.
In a specific examples, the first parts can comprise: the first contact part, and the middle body in the outside of its contact battery module, is formed to be bracket shape when observing in horizontal section; With the 2nd contact part, it extends to the cathode conductive portion with conducting parts and part corresponding to anode conducting part from the phase offside of the first contact part.
Elasticity guides part to be not particularly limited, and contacts with each other as long as the first parts and the 2nd parts can be formed repeatedly and is separated from each other. Such as, elasticity guides part can be included in compression spring and be placed in the state between the first parts and the 2nd parts to be coupled to the bolt of the first parts and the 2nd parts and the combination of nut.
Specifically, when battery unit swells due to the excessive charging of battery unit, the corresponding side in battery unit pushes the first parts. As a result, the first parts are formed with the 2nd parts and contact. Therefore, it is achieved the conductivity between the first parts and conducting parts.
Meanwhile, each in single-bit module can comprise: two or more battery unit, and it is configured to have electrode terminal and is mutually connected in series and the stacked structure that is bent of the electrode terminal connection portion of electrode terminal; With one pair of sheath component, it is coupled the outside to cover the stacking body of the battery unit except electrode terminal completely.
Preferably, each in sheath component can have internal structure corresponding to the outer shape of body stacking with battery unit, and sheath component can by assembling and fastening and be coupled to each other.
Specifically, the coupling, cross section of sheath component can be formed to have symmetric curvature structure when observing in vertical section, make when sheath component contact with each other thus by sheath component to, when being pushed against each other, sheath component is coupled by elasticity and is bonded with each other in state each other.
In another example, the coupling, cross section of sheath component can be coupled to each other by fastening projection and fastening groove, make when sheath component contact with each other thus by sheath component to, when being pushed against each other, sheath component is coupled by elasticity and is bonded with each other in state each other.
Preferably, electrode terminal is coupled to each other by welding. But, embodiments of the invention are not limited to this.
Each in battery unit has little thickness and relative big width and length, thus when battery unit is stacked to form battery module the plate shape secondary cell of the overall dimension of minimise battery module. A preferred embodiment of secondary cell can be a kind of secondary cell being configured to have following structure, and wherein the electrode assemblie of cathode/separator/anode structure is installed in the battery case formed by the laminate comprising resin layer and metal level and cathode terminal and anode terminal are given prominence to from the opposite end of battery case. Specifically, electrode assemblie can be installed in the bag shape battery case formed by aluminium laminate. The secondary cell with above structure can be referred to as " bag shape battery unit ". But, above battery unit provides only by signal. Obviously, the present invention can be applied to the battery unit of all types, the outside of the battery case of each that the expansion of the volume of each in battery unit is passed in battery unit.
Meanwhile, during the charging and discharging of secondary cell, secondary cell produces heat. In order to increase the life-span of secondary cell, the heat effectively produced from secondary cell discharge is important.
Therefore, sheath component can be present the high strength unit cover of heat that high thermal conductivity produces to be outwards emitted in battery unit more easily. Preferably, each in unit cover is formed by metal sheet.
The upper end of each that electrode terminal can be formed in battery unit or lower end. Alternately, the top and bottom place of each that electrode terminal can be formed in battery unit respectively.
According to circumstances, when the protuberance of battery unit cause two to five times of the thickness of each be equivalent in battery unit, the increase of the volume of battery unit time, what isolating switch can sense the volume of battery unit changes the circuit to disconnect series of cells. This kind of setting range can be changed according to the security test standard of desired battery module.
Based on desired output and capacity, the series of cells according to the present invention can be manufactured by assembled battery module. In addition, it is contemplated that to installing efficiency and structural stability ground, the power supply for electric vehicle, motor vehicle driven by mixed power, plug-in hybrid vehicle or electric power storing device can be used as according to the series of cells of the present invention. But, it is not limited to this according to the scope of application of the series of cells of the present invention.
Accompanying drawing explanation
Fig. 1 is the exemplary view of the circuit illustrating conventional batteries;
Fig. 2 and 3 illustrates bending to form the one of single-bit module according to one embodiment of present invention to the skeleton view of the process of battery unit;
Fig. 4 is the skeleton view illustrating the single-bit module stacked body according to the present invention;
Fig. 5 is the view of the circuit illustrating series of cells according to one embodiment of present invention;
Fig. 6 is the fragmentary, perspective view of the side of the series of cells illustrating Fig. 5;
Fig. 7 is the plan view illustrating the state before the breaker operator of Fig. 5; And
Fig. 8 is the plan view illustrating the state after the breaker operator of Fig. 5.
Embodiment
Now, the exemplary embodiment of the present invention is described in detail with reference to accompanying drawing. It should be noted, however, that the embodiment that the scope of the present invention is not illustrated limits.
Fig. 2 and 3 typically illustrates bending to form one of the single-bit module according to the present invention to the skeleton view of the process of battery unit, and Fig. 4 is the skeleton view typically illustrating the single-bit module stacked body according to the present invention.
With reference to these figure, at two bag shape battery units 11 and 12 in a longitudinal direction by arranged in series, make in electrode terminal 13 and 14 state in succession located adjacent one another of bag shape battery unit 11 and 12, the electrode terminal 13 and 14 of bag shape battery unit 11 and 12 is soldered to each other, and then bag shape battery unit 11 and 12 is folded so that the mutual crossover of bag shape battery unit 11 and 12. According to circumstances, the electrode terminal 13 and 14 of bag shape battery unit 11 and 12 can be couple to each other by welding in the folded state making the mutual crossover of electrode terminal of electrode terminal.
In addition, as shown in FIG. 3, the electrode terminal connection portion 15 of the stacking body 100a of battery unit being made up of folded bag shape battery unit is bent with bracket shape, and at electrode terminal connection portion 15 place, electrode terminal is coupled by welding.
Single-bit module stacked body 200 is configured to have following structure, in the structure shown here, by stacking with zig-zag in the state that four single-bit modules 202,203,204 and 205 are connected in series mutually at single-bit module 202,203,204 and 205, each in single-bit module 202,203,204 and 205 is manufactured with the structure that battery unit is covered by sheath component 210.
In addition, single-bit module 202 comprises two battery units 11 and 12 and to sheath component 210, these two battery units 11 and 12 are configured to have electrode terminal 13 and 14 and are mutually connected in series and the stacked structure that is bent of the electrode terminal connection portion 15 of electrode terminal 13 and 14, and sheath component 210 one is coupled the outside of the stacking body 100a of the battery unit to cover completely except electrode terminal 13 and 14 by this.
In the state that linear projection 211a, 211b, 211c, 211d and 211e are spaced from each other in a lateral direction, the outside of each in sheath component 210 forms linear projection 211a, 211b, 211c, 211d and 211e. Ground is tiltedly arranged by the linear projection 211a and 211e in a lateral direction with little length each other.
Each in sheath component 210 has internal structure corresponding to the outer shape of body 100a stacking with battery unit. Sheath component 210 is by assembling and fastening and be coupled to each other.
Specifically, the fastened projection in coupling, cross section of sheath component 210 and fastening groove are couple to each other, make when sheath component 210 contact with each other thus in state each other to be pushed against each other sheath component 210 time, sheath component 210 is coupled by elasticity and is bonded with each other.
Fig. 5 is the view of the circuit typically illustrating series of cells according to one embodiment of present invention.
With reference to this width figure, series of cells 900 comprises the fusible cut-out 800 of the electrical connection circuit 802 being connected in series between battery module 301 and 302, and is arranged on the isolating switch 700 of outside with the execution conductivity when battery unit swells of outer battery module 301. When performing conductivity due to battery unit protuberance, isolating switch 700 is electrically connected to electrical connection circuit 802 to disconnect fusible cut-out 800.
The cathode terminal 304 of a battery module 301 outer and the anode terminal 306 of another outer battery module 302 are electrically connected to cathode conductive portion 711 and the anode conducting part 712 of isolating switch 700 respectively via wire.
In addition, in series of cells 900, electrode terminal part is fixed, even if making also to maintain the stacked state of battery module 301 and 302 when the volume of battery unit changes, and isolating switch 700 is positioned at the part place corresponding with the side of the protuberance due to battery unit and outer battery module 301 that the expansion stress that causes focuses on. Therefore, substantially prevent basis from being possible for supplying the fault of the series of cells of the electrical signal of electric power.
Specifically, in the normal state of battery module 301 and 302, isolating switch 700 is cut off. As a result, the electric current produced by battery module 301 and 302 does not flow to cathode conductive portion 711 and anode conducting part 712. Therefore, fusible cut-out 80 is not disconnected, unless due to other reason any, overcurrent flows in electrical connection circuit 802. Electric current from series of cells 900 flow to outer part device (not shown) via outside input and output terminal (not shown) usually.
Such as, in the situation of battery module 301 and 302 exception, in the situation that overcurrent flows in battery module 301 and 302, battery unit swells, and the expansion power of result battery unit is passed to outer battery module 301.
Expansion power is passed to the isolating switch 700 at the side place being positioned at outer battery module 301, to perform conductivity between the cathode conductive portion 711 of isolating switch 700 and anode conducting part 712.
Due to this kind of conductivity, high electric current flows in the electrical connection circuit 802 of series of cells 900. As a result, fusible cut-out 800 disconnects, and therefore flows in the electrical connection circuit 802 of series of cells 900 without any electric current.
Fig. 6 is the fragmentary, perspective view of the side of the series of cells typically illustrating Fig. 5, and Fig. 7 is the plan view typically illustrating the state before the breaker operator of Fig. 5.
In addition, Fig. 8 is the plan view illustrating the state after the breaker operator of Fig. 5.
Together with Fig. 5 with reference to these figure, isolating switch 700 comprises: the first conducting parts 720, its contact outer battery module 301 side; 2nd non-conductive parts 710; And conducting parts, it comprises cathode conductive portion 711 and the anode conducting part 712 of the electrical connection circuit 802 being electrically connected between battery module 301 and 302.
Being fixed in the state of position at the 2nd parts 710 about outer battery module 301, the 2nd parts 710 guide part 750 to be couple to the first parts 720 via elasticity.
Conducting parts is installed to the 2nd parts 710. When the volume of outer battery module 301 increases due to the protuberance of battery unit, conducting parts is formed with the first parts 720 and contacts.
First parts 720 comprise the first contact part 721 and the 2nd contact part 722 and 723, and this first contact part 721 contacts the middle body in the outside of outer battery module 301, this first contact part 721 be formed when observing in horizontal section be bracket shape (Formula shape), the 2nd contact part 722 and 723 extends to the cathode conductive portion 711 with conducting parts and part corresponding to anode conducting part 712 from the phase offside of the first contact part 721.
In addition, elasticity guides part 750 to be included in compression spring 753 to be placed in the state between the first parts 720 and the 2nd parts 710 by variable to be couple to the bolt 751 of the first parts 720 and the 2nd parts 710 and the combination of nut 752.
Hereinafter, the operation that will describe in state that isolating switch 700 normally or extremely operates in battery module 301 and 302.
In the state that battery module 301 and 302 normally operates, as shown in FIG. 7, first, the first parts 720 and the 2nd parts 710 or by electricity mutually or mechanically separate.
On the other hand, when, in the state extremely operated in battery module 301 and 302, when battery unit swells, as shown in FIG. 8, the first parts 720 are outwards pushed by the battery module 301 of volumetric expansion. As a result, the opposite end of the first parts 720 contacts with anode conducting part 712 formation with cathode conductive portion 711. Therefore, high electric current flows between cathode conductive portion 711 and anode conducting part 712, and thus fusible cut-out 800 disconnects.
Specifically, the cathode terminal 304 of a battery module 301 outer and the anode terminal 306 of another outer battery module 302 are electrically connected to cathode conductive portion 711 and the anode conducting part 712 of isolating switch 700 respectively via wire.
In addition, in the state that battery module 301 and 302 normally operates, the first parts 720 are separated from the cathode conductive portion 711 of conducting parts and anode conducting part 712 electricity.
But, when in the state extremely operated in battery module 301 and 302, when battery unit swells (dotted line see Fig. 8), first parts 720 are outwards pushed by the outer battery module 301 of volumetric expansion, and the 2nd contact part 722 of the first parts 720 guides part 750 to contact with anode conducting part 712 formation with the cathode conductive portion 711 of conducting parts with 723 via elasticity. As a result, electric current flows between cathode conductive portion 711 and anode conducting part 712.
Although in order to schematically be intended to disclose the exemplary embodiment of the present invention, but it will be appreciated by those skilled in the art that, when not deviateing the scope and spirit such as the present invention disclosed in the following claims, various amendment, interpolation and replacement are all possible.
Industrial applicibility
As illustrated clearly according to above, series of cells according to the present invention comprises isolating switch and fusible cut-out, make when battery unit swells due to the abnormal operation of such as excessively the charging of battery module, over-discharge can and overcurrent or the deterioration of battery module that causes by the charging and discharging of battery unit, circuit breaker sense to disconnect fusible cut-out, thus guarantees desired level of security to the expansion of the volume in the outside of battery unit.
In addition, series of cells according to the present invention does not need electric power. As a result, there is not the fault of any series of cells according to electrical signal, even and if when electric power be not supplied to BMS and therefore BMS inoperation time, it is ensured that the security of series of cells and the reliability of improving series of cells widely is also possible.
And then, by adding little simple component, this series of cells mechanically operates, and thus this series of cells is easy to manufacture and is differently manufactured based on this.

Claims (17)

1. a series of cells, described series of cells is configured to, battery module is made mutually to be in close contact in described battery module or stacking adjacent to each other state is connected in series mutually, each in described battery module comprises the multiple battery unit or single-bit module that are mutually connected in series, and described series of cells comprises:
Fusible cut-out, described fusible cut-out is connected in series in the electrical connection circuit between described battery module;
Isolating switch, the outside of at least one that described isolating switch is arranged in described battery module, to perform conductivity when described battery unit swells, when performing conductivity when the protuberance due to described battery unit, described isolating switch is electrically connected to described electrical connection circuit to disconnect described fusible cut-out, and
Wherein, described isolating switch comprises:
First conducting parts, described first conducting parts contacts the side of in described battery module;
2nd non-conductive parts, described 2nd non-conductive parts are fixed in the state of position at described 2nd non-conductive parts about described battery module, guide part to be couple to described first conducting parts via elasticity; With
Conducting parts, described conducting parts comprises cathode conductive portion and anode conducting part, described cathode conductive portion and described anode conducting part are installed to described 2nd non-conductive parts, described cathode conductive portion and described anode conducting part is made to be formed with described first conducting parts and contact according to the increase of the volume of described battery module when described battery unit swells, the described electrical connection circuit that described cathode conductive portion and described anode conducting part are electrically connected between described battery module.
2. series of cells according to claim 1, wherein, the electrode terminal part of described series of cells is fixed, even if making when the volume of described battery unit changes, also the stacked state of described battery module is maintained, and the part place that the side of in the described battery module that focuses on of the expansion stress that described isolating switch is located in the protuberance due to described battery unit causes one is corresponding.
3. series of cells according to claim 1, wherein, described isolating switch is located in the part place corresponding with the side of outer battery module.
4. series of cells according to claim 1, wherein, the cathode terminal of a battery module outer and the anode terminal of another outer battery module are electrically connected to the described cathode conductive portion of described isolating switch and described anode conducting part respectively via wire.
5. series of cells according to claim 1, wherein, in the state that described battery module normally operates, described first conducting parts and described conducting parts are separated by mutual electricity.
6. series of cells according to claim 1, wherein, when battery unit described in the state extremely operated in described battery module swells, described first conducting parts is outwards pushed by the described battery module of volumetric expansion, the opposite end of the first conducting parts described in result contacts with the formation of described anode conducting part with described cathode conductive portion, thus high electric current flows between described cathode conductive portion and described anode conducting part, and therefore described fusible cut-out disconnects.
7. series of cells according to claim 1, wherein, described first conducting parts comprises:
First contact part, described first contact part is formed to be bracket shape when observing in horizontal section, and described first contact part contacts the middle body in the outside of described battery module; With
2nd contact part, described 2nd contact part extends to the described cathode conductive portion with described conducting parts and part corresponding to described anode conducting part from the phase offside of described first contact part.
8. series of cells according to claim 1, wherein, described elasticity guides part to be included in compression spring and is placed in the state between described first conducting parts and described 2nd non-conductive parts to be coupled to described first conducting parts and the described bolt of the 2nd non-conductive parts and the combination of nut.
9. series of cells according to claim 1, wherein, each in described single-bit module comprises:
Two or more battery unit, described battery unit is configured to have electrode terminal and is mutually connected in series and the stacked structure that is bent of the electrode terminal connection portion of described electrode terminal; With
One pair of sheath component, described sheath component is coupled the outside to cover the stacking body of the battery unit except described electrode terminal completely.
10. series of cells according to claim 9, wherein, each in described sheath component has the internal structure corresponding with the outer shape of the stacking body of described battery unit, and described sheath component is by assembling and fastening and be coupled to each other.
11. series of cells according to claim 9, wherein, described electrode terminal is coupled to each other by welding.
12. series of cells according to claim 1, wherein, each in described battery unit is plate shape battery unit, described plate shape battery unit is configured to have following structure, in described structure, being installed in the state in battery case at electrode assemblie, the edge of the described battery case formed by the laminate comprising resin layer and metal level is sealed.
13. series of cells according to claim 12, wherein, described battery case is the bag shape shell formed by aluminium laminate.
14. series of cells according to claim 9, wherein, described sheath component is high strength unit cover.
15. series of cells according to claim 9, wherein, the upper end of each that described electrode terminal is formed in described battery unit or lower end, or the top and bottom place of each being formed in respectively in described battery unit.
16. series of cells according to claim 1, wherein, when the protuberance of described battery unit cause two to five times of the thickness of each be equivalent in described battery unit, the increase of the volume of described battery unit time, described circuit breaker sense to the change of the volume of described battery unit, to disconnect the described circuit of described series of cells.
17. series of cells according to claim 1, wherein, described series of cells is used as the power supply of electric power storing device.
CN201280035095.XA 2011-07-25 2012-06-13 There is the series of cells of the security of improvement Active CN103650211B (en)

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